Maybe I missed something; if they can’t find any flaws in General Relativity, how do they know there are any? This article is easy enough for me to understand, but some of this stuff can and does go over my head.
It is fascinating, however.
Anything that keeps this 67yr old brain’s gears moving is a good thing🙂!
It’s still a theory until proven otherwise.........................
In this case, they’re looking at an extreme scenario where both the theory can be observed in practice (it’s hard to observe in the first place), and where any flaws should become apparent (by observation deviating from prediction).
Science assumes that any theory has limits, conditions where it doesn’t apply. If we can’t think of such limits, we try to find conditions where the theory breaks down in reality. Impressive when extremes are examined, and the theory STILL predicts accurately.